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repetitive stress injury

(Encyclopedia)repetitive stress injury or repetitive strain injury (RSI), injury caused by repeated movement of a particular part of the body. Often seen in workers whose physical routine is unvaried, RSI has becom...

Tagus

(Encyclopedia)Tagus tāˈgəs [key], Span. Tajo, Port. Tejo, river, c.585 mi (940 km) long, rising in the mountains E of Madrid, E Spain, and draining the central part of the Iberian Peninsula. The Tagus flows nort...

air lock

(Encyclopedia)air lock, compartment connecting two different environments, usually at different pressures, that enables personnel to transfer from one environment to the other. Space capsules have air locks to enab...

Kyushu

(Encyclopedia)Kyushu kyo͞oˈsho͞o [key], island (1990 pop. 13,064,955), c.13,760 sq mi (35,640 sq km), S Japan. It is the third largest, southernmost, and most densely populated of the major islands of Japan. It ...

echo, in acoustics

(Encyclopedia)echo, reflection of a sound wave back to its source in sufficient strength and with a sufficient time lag to be separately distinguished. If a sound wave returns within 1⁄10 sec, the human ear is in...

Douglas, Donald Wills

(Encyclopedia)Douglas, Donald Wills, 1892–1981, aviation pioneer and aerospace executive, b. Brooklyn, N.Y., B.S. Massachusetts Institute of Technology, 1914. He helped design the first wind tunnel (1914–15) an...

Qingdao

(Encyclopedia)Qingdao tsĭngˈtouˈ, chĭngˈdouˈ [key], city (1994 est. pop. 1,584,100), SE Shandong prov., E China, on the Yellow Sea. With an excellent ice-free harbor, it is a major fishing and trade port of C...

Moses, Robert

(Encyclopedia)Moses, Robert, 1888–1981, U.S. public official, b. New Haven, Conn. He was appointed (1919) by Alfred E. Smith to the committee to study and revamp New York state government machinery, became (1924)...

Hezekiah

(Encyclopedia)Hezekiah hĕzəkīˈə [key], in the Bible, king of Judah, son and successor of Ahaz. During his reign Sennacherib of Assyria routed (701 b.c.) the rebellious Jews, laid seige to Jerusalem, and exacte...

Delmarva

(Encyclopedia)Delmarva dĕlmärˈvə [key], peninsula, c.180 mi (290 km) long, separating Chesapeake Bay on the west from Delaware Bay and the Atlantic Ocean on the east; named for the three states (Delaware, Maryl...